class views_plugin_argument_validate extends views_plugin {

  /**
   * Initialize this plugin with the view and the argument
   * it is linked to.
   */
  function init(&$view, &$argument, $options) {
    $this->view = &$view;
    $this->argument = &$argument;

    $this->convert_options($options);
    $this->unpack_options($this->options, $options);
  }

  /**
   * Retrieve the options when this is a new access
   * control plugin
   */
  function option_definition() {
    return array();
  }

  /**
   * Provide the default form for setting options.
   */
  function options_form(&$form, &$form_state) {
  }

  /**
   * Provide the default form form for validating options
   */
  function options_validate(&$form, &$form_state) {
  }

  /**
   * Provide the default form form for submitting options
   */
  function options_submit(&$form, &$form_state, &$options = array()) {
  }

  /**
   * Convert options from the older style.
   *
   * In Views 3, the method of storing default argument options has changed
   * and each plugin now gets its own silo. This method can be used to
   * move arguments from the old style to the new style. See
   * views_plugin_argument_default_fixed for a good example of this method.
   */
  function convert_options(&$options) {
  }

  /**
   * Determine if the administrator has the privileges to use this plugin
   */
  function access() {
    return TRUE;
  }

  /**
   * If we don't have access to the form but are showing it anyway, ensure that
   * the form is safe and cannot be changed from user input.
   *
   * This is only called by child objects if specified in the options_form(),
   * so it will not always be used.
   */
  function check_access(&$form, $option_name) {
    if (!$this->access()) {
      $form[$option_name]['#disabled'] = TRUE;
      $form[$option_name]['#value'] = $form[$this->option_name]['#default_value'];
      $form[$option_name]['#description'] .= ' <strong>' . t('Note: you do not have permission to modify this. If you change the default filter type, this setting will be lost and you will NOT be able to get it back.') . '</strong>';
    }
  }

  function validate_argument($arg) {
    return TRUE;
  }

  /**
   * Process the summary arguments for displaying.
   *
   * Some plugins alter the argument so it uses something else interal.
   * For example the user validation set's the argument to the uid,
   * for a faster query. But there are use cases where you want to use
   * the old value again, for example the summary.
   */
  function process_summary_arguments(&$args) {
  }
}